Fourths to frederick milton johnson



No. 6l3,666. Patented Nov. 8, I898. J. T. DAVIS.

QUARTZ MILL.

(Application filed Jan. 14, 1897.)

(No Model.)

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\NITED STATES PATENT OFFICE.

JOHN T. DAVIS OF SAN FRANCISCO, CALIFORNIA, ASS-IGNOR OF THREE- FOURTIIS TO FREDERICK MILTON JOHNSON, OF SAME PLACE.

QUARTZ-MILL.

SPECIFICATION forming part of Letters Patent No. 613,666, dated November 8, 1898. Application filed January 14,1897. Serial No. 619,225. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN T. DAVIS, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented'certain new and useful Improvements in Quartz-Mills; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to quartz-mills intended more particularly for the fine crushing and pulverizing of ore; and its object is to subject the ore to a more perfect and thorough crushing than has before been accomplished in machines of this character. construction by which I accomplish this obj ect and which is shown in the accompanying drawings consists, speaking generally, of a casing carrying a corrugated die or ring, a corrugated disk mounted upon a central shaft in the casing, and a series of corrugated rollers engaging said die and said disk and travelin g with a rotary and revolving movement, the plane of which is vertical.

In addition to these general features my machine contains special details of construction relating to the feeding and distribution of the ore within the casing, to means for creating the friction and pressure required to produce perfect grinding, and for compensating the wear in the dies. All of such details are fully hereinafter described and are shown in the accompanying drawings, in which Figure 1 is a horizontal section of the easing and outer die, with the driving-gearing, the central disk, and the grinding-rollers in plan view. Fig. 2 is an elevation of the screen side of the casing, partly broken away'to show a vertical section of the casing and side elevations of the grinding-rollers, disk, and die.

A represents a cylindrical cast-iron casing having a base A and Web A for supporting it in position. One side of the casing is closed by a head B, cut away, as shown, to receive the side screens C, and the other side by a solid head D,both heads being bolted to flanges 1, formed with the casing. A shaft E passes centrally and horizontally through the casing and is journaled in boxes 2, as shown. On the end of the shaft is a large gear F, geared The down for power from a pinion G on the driving-shaft H', the latter carrying tight andloose belt-pulleys and also a fly-wheel to give a steady motion to the said shaft. Located in the middle of the casing and" secured to the shaft E is a die or cylinder I, having a pcriphery formed with rounded corrugations and alternating depressions 3.

An annular sectional die J is placed loosely in the casing, so as to fit the inner periphery of the latter. This die is preferably made in four sections, the ends of which abut and are beveled or inclined,'as shown, toward the center. The edges of the die-sections are formed with teeth corresponding to those upon the central cylinder I. Between the die-sections and the cylinder I is a series of corrugated grinding-rollers, the corrugations of which engage with both the die-sections and the central cylinder, so that a positive gearing is produced between the die, rollers, and cylinder.

The ore-hopper K is at the top of the casing and at one side, above an opening 4 in the casing. A revolving conical deflector L is secured within the casing by means of a hub 5 on the shaft E. This deflector fits closely to the central disk and also against the solid head of the casing below the hopper and deflects the ore fed in through such hopper toward the center of the machine. The greater part of the ore is thus caused to reach the grinding-surface; but any part which falls off the deflector into the bottom of the casing between the deflector and the grinding-dies simply banks up against the deflector,which forces it toward the die. If, for illustration,we consider Fig. 1 to be a vertical section, it is evident that ore which banks up upon the bottom in the triangular space at the lower right-hand corner of the casing will as it banks be crowded toward the grinding-s11 rfaces. The main shaft is geared down to such an extent that the motion of the deflector is too slow to give centrifugal force enough to throw the ore outward.

The corrugated rollers are driven around by the motion imparted to the central cylinder, the crushing being accomplished between the corrugated surfaces. The pressure required to produce the grinding action is exerted upon the loose die-sections by pressure-plates 6, which bear upon adjoining dies at thejoints. These plates have stems 7, which project through the casing and which are forced constantly inward by strong springs S. The pressure of the springs is regulated by a follower 9 and screw 10, working in a chamber l1,which incloses the springs and stem. The periphery of the die-sections is preferably channeled, Fig. 1, to give a good bearing forthe pressureplates and hold them in place. The pressure of the springs above the V-shaped joints of the die-sections makes the latter self-compensating for wear at the points where the beveled ends converge.

On the back or screen side of the machine a space is left for the action of the water, and thepulp is kept in agitation by wings or stirrers M, attached to the central shaft and revolving in this space. These wings perform a double purposefirst, to keep the pulp in agitation and prevent it from settling, and, secondly, to throw the pulverized material against the screens. The wings should be made flaring or inclined at an angle to the plane of their revolution in order to accomplish this operation thoroughly. Any material not sufficiently pulverized to pass the screens will find its way between the corrugated grinding-surfaces and be exposed to a regrindin I have shown in the drawings six grindingrollers between the central cylinder and outer dies; but this number is not arbitrarily fixed, since anynumber of such rollers may be used, according to the size of the machine, character of the ore, and other conditions found in actual use.

It will be observed that the grinding is done positively between the corrugated surfaces during the revolution of the machine in a vertical plane and that the ends of the rollers perform no grinding action. The intermeshing corrugations therefore serve not only as actual grinding-surfaces, but also as gearing for the rollers and to keep the latter spaced in their proper positions while revolving and rotating. It should also be noticed that it would be possible to reverse the action of the machine so far as to make the inner cylinder stationary and cause the outer die to revolve. The eifect upon the intermediate rollers would be the same in causing them to rotate and revolve and to pulverize the ore by grinding between intermeshing corrugated surfaces.

What I claim as new, and desire to secure by Letters Patent, is-- 1. In a quartz-n1ill and in combination, a casing having a feed-opening at the top, a circular corrugated die inclosed by said casing, a rotary corrugated cylinder or die, placed centrally in the casing, and a series of corrugated grinding-rollers spaced between said die and disk and positively engaging both of them, and means for rotating said central disk and thereby rotating and revolving said rollers in a vertical plane, and means for producing pressure on the sections of the stationary die, substantially as described.

2. In a quartz-mill and in combination, a casing having a feed-opening at its top, a sectional die, pressure-plates tending to force said sections inwardly, a central corrugated cylinder, and a series of grinding-rollers, corrugated to engage said central disk, and running in contact with said sectional die, substantially as described.

3. In a quartz-mill, a casing, a sectional cylindrical die having beveled abutting ends, pressure plates overlapping the V- shaped joints produced by said abutting ends, a cen* tral rotating cylinder, and rotating crushingrollers located between said cylinder and die, substantially as described.

4:. In a quartz-mill and in combination, a casing, an annular die inclosed thereby, a central rotary die or cylinder, a series of grinding-rollers traveling in a vertical plane in contact with said die and cylinder, and a conical deflector extending from the casinghead toward the center of rotation, substan= tially as described.

5. In a quartz-mill and in combination, a casing, a stationary, sectional, corrugated die of cylindrical form, pressure devices tend ing to force said sections inwardly, a rotary corrugated cylinder, secured to a horizontal shaft in the casing, and a series of corrugated rollers, geared positively to said die and said cylinder and having a combined rotation and revolution around said disk, substantially as described.

6. In a quartz-mill and in combination, a casing, a stationary die, composed of separate sections, springs for putting pressure upon said sections, a disk, rotating centrally in the casing, upon a horizontal shaft, a feed-opening in the top of the casing and at one side of its central line, a series of grinding-rollers, revolving and rotating between said central disk and said die-sections, a casing-head provided with a screen-face, and stirrer-s mounted on the horizontal shaft and revolving vertically between the grinding-dies and the screen, substantially as described.

7. In combination the circular casing, the curved die-sections having abutting ends and forming a complete annular or cylindrical die, the central cylinder, the grinding-rollers interposed between said central cylinder and annular die, the pressure-plates overlapping the joints between adjacent sections, and the means for applying pressure to said plates, substantially as described.

8. In combination the circular casing, the curved die-sections having abutting ends and forming a complete annular or cylindrical die, the central cylinder, the grinding-rollers interposed between said central cylinder and eiae 3 annuiar die, the pressure-piates overlapping nature, in presence of two Witnesses, this 2d the joints between adjacent sections and day of June, 1896. having stems extending through the casing,

springs for placing tension on said stems, and DAVIS 5 screw-fo110wers for Varying the tension of the Witnesses:

springs, substantially as described. H. J. LANG,

In testimony whereof I have affixed my sig- L. W. SEELY. 

